Synoptic of a V24 - General principle of a V24 exchange
A13
8
6
2
Vers
io
n E
-
Pa
ge
6-
15
ACK or NACK
Control byte
Data
Length
Identification
ACK or NACK
ENQ
•
Da
ta
se
nding f
rom t
h
e c
o
mput
er
to t
h
e pr
inte
r
PRINTER
CALCULATOR
The length is the number of bytes comprised between
the length and the checksum byte.
Zero byte in case of request from the calculator of the
printer.
1 byte specifying th jet number in case of a request
concerning a jet.
n bytes without specifying the jet number in case of a
sending concerning the printer in general.
n bytes following one byte specifying the jet number
in case of a sending concerning a jet.
Specific for each
See table pages 4-2 to 4-4
Checksum.
This represent an "OR" exclusive of all preceding
bytes (identification, length and data bytes).
Length (2 octets)
Data (0 to n bytes)
Identification (1 byte)
Control (1 byte)
INITIALISATION
OF TRANSFER:
OPTIONAL
INITIALISATION
OF TRANSFER:
OPTIONAL
Control byte
Data
Length
Identification
Data
Lenght
Identification
ACK
Control byte
ACK or NACK
NACK
or
ENQ
• Dat
a
r
e
qu
es
t fr
om th
e co
mput
er
to
th
e pr
in
te
r
PRINTER
CALCULATOR